1 7-Zip method IDs (9.18) 2 ----------------------- 3 4 Each compression or crypto method in 7z has unique binary value (ID). 5 The length of ID in bytes is arbitrary but it can not exceed 63 bits (8 bytes). 6 7 If you want to add some new ID, you have two ways: 8 1) Write request for allocating IDs to 7-zip developers. 9 2) Generate 8-bytes ID: 10 11 3F ZZ ZZ ZZ ZZ ZZ MM MM 12 13 3F - Prefix for random IDs (1 byte) 14 ZZ ZZ ZZ ZZ ZZ - Developer ID (5 bytes). Use real random bytes. 15 16 MM MM - Method ID (2 bytes) 17 18 You can notify 7-Zip developers about your Developer ID / Method ID. 19 20 Note: Use new ID only if old codec can not decode data encoded with new version. 21 22 23 List of defined IDs 24 ------------------- 25 26 00 - Copy 27 28 03 - Delta 29 04 - x86 (BCJ) 30 05 - PPC (Big Endian) 31 06 - IA64 32 07 - ARM (little endian) 33 08 - ARM Thumb (little endian) 34 09 - SPARC 35 21 - LZMA2 36 37 02.. - Common 38 03 Swap 39 - 2 Swap2 40 - 4 Swap4 41 42 03.. - 7z 43 01 - LZMA 44 01 - Version 45 46 03 - Branch 47 01 - x86 48 03 - BCJ 49 1B - BCJ2 50 02 - PPC 51 05 - PPC (Big Endian) 52 03 - Alpha 53 01 - Alpha 54 04 - IA64 55 01 - IA64 56 05 - ARM 57 01 - ARM 58 06 - M68 59 05 - M68 (Big Endian) 60 07 - ARM Thumb 61 01 - ARMT 62 08 - SPARC 63 05 - SPARC 64 65 04 - PPMD 66 01 - Version 67 68 7F - 69 01 - experimental methods. 70 71 72 04.. - Misc 73 00 - Reserved 74 01 - Zip 75 00 - Copy (not used). Use {00} instead 76 01 - Shrink 77 06 - Implode 78 08 - Deflate 79 09 - Deflate64 80 10 - Imploding 81 12 - BZip2 (not used). Use {04 02 02} instead 82 14 - LZMA 83 60 - Jpeg 84 61 - WavPack 85 62 - PPMd 86 63 - wzAES 87 02 - BZip 88 02 - BZip2 89 03 - Rar 90 01 - Rar15 91 02 - Rar20 92 03 - Rar29 93 04 - Arj 94 01 - Arj (1,2,3) 95 02 - Arj 4 96 05 - Z 97 06 - Lzh 98 07 - Reserved for 7z 99 08 - Cab 100 09 - NSIS 101 01 - DeflateNSIS 102 02 - BZip2NSIS 103 104 105 06.. - Crypto 106 00 - 107 01 - AES 108 0x - AES-128 109 4x - AES-192 110 8x - AES-256 111 Cx - AES 112 113 x0 - ECB 114 x1 - CBC 115 x2 - CFB 116 x3 - OFB 117 118 07 - Reserved 119 0F - Reserved 120 121 F0 - Misc Ciphers (Real Ciphers without hashing algo) 122 123 F1 - Misc Ciphers (Combine) 124 01 - Zip 125 01 - Main Zip crypto algo 126 03 - RAR 127 02 - 128 03 - Rar29 AES-128 + (modified SHA-1) 129 07 - 7z 130 01 - AES-256 + SHA-256 131 132 07.. - Hash (subject to change) 133 00 - 134 01 - CRC 135 02 - SHA-1 136 03 - SHA-256 137 04 - SHA-384 138 05 - SHA-512 139 140 F0 - Misc Hash 141 142 F1 - Misc 143 03 - RAR 144 03 - Rar29 Password Hashing (modified SHA1) 145 07 - 7z 146 01 - SHA-256 Password Hashing 147 148 149 150 151 --- 152 End of document 153
